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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) $ in Thousands, € in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 22, 2022	Jan. 31, 2025 USD ($)	Dec. 31, 2025	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jan. 31, 2025 EUR (€)	Jun. 30, 2022 USD ($)
Highly Liquid Investments Maturity Period (Year)					3 years
Inspection Interval (Year)					5 years
Increase Of Amortization Period (Month)					30 months
Number Of Offshore Supply Vessels					211	217
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax					$ (0)	$ (300)
Wage and Sick Cost Refund, Amount					11,800	$ 6,100
Debt Security, Corporate, Non-US [Member]
Debt Instrument, Interest Rate, Stated Percentage								8.75%
PEMEX [Member]
Accounts Receivable, before Allowance for Credit Loss, Current					700			$ 8,600
Debt Securities, Available-for-Sale, Sold at Par Value					$ 8,000
Marine Equipment [Member]
Property, Plant and Equipment, Salvage Value, Percentage					7.50%
Marine Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)					10 years
Marine Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)					20 years
Property, Plant and Equipment, Other Types [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)					3 years
Property, Plant and Equipment, Other Types [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)					10 years
Actively Employed Vessels [Member]
Number of Vessels					210	215
Stacked Vessels [Member]
Number of Vessels					1	2
Alucat Crew Boats [Member]
Number of Vessels					8
Alucat Crew Boats, Expected Cost, Each					$ 4,000
Alucat Crew Boats [Member] \| Forecast [Member]
Number of Vessels		5	1	6
Alucat Crew Boats, Expected Cost, Each				$ 2,500
Down Payment To Start Construction On Crew Boats				$ 2,900
Alucat Crew Boats [Member] \| Forecast [Member] \| Supplier Facility Agreements for Five Vessels Delivered [Member]
Debt Instrument, Face Amount		$ 9,700					€ 9.4
Alucat Crew Boats [Member] \| West Africa [Member]
Number of Vessels					2
Alucat Crew Boats, Expected Cost, Each					$ 6,000
Solstad Offshore ASA [Member]
Number of Vessels, Offshore Support					37
Swire Pacific Offshore Holdings Ltd. [Member]
Number of Vessels, Offshore Support	50				50
Swire Pacific Offshore Holdings Ltd. [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)					1 year
Swire Pacific Offshore Holdings Ltd. [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)					16 years